March in San Antonio feels like spring—but cold snaps can still show up and catch homeowners off guard. Historically, the average “last freeze” for San Antonio is around late February, but that doesn’t mean March is risk-free—especially in drafty garages, utility rooms, and outdoor installs.
If your water softener sits in a garage, shed, or outdoors, a single freezing night can crack fittings, damage the control head, and create leaks that don’t show up until everything thaws.
Below is a San Antonio-specific, step-by-step checklist to protect your water softener and plumbing before, during, and after freezing nights—updated for a March post (when people tend to relax their freeze routine).









